My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6702AZKA+
- Part No.:
- MAX6702AZKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702AZKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6702AZKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors +3.3V supply voltage with a 3.08V reset threshold, provides 140ms reset timeout, independent watchdog output (WDO), and power-fail warning via PFI/PFO. It operates from 1.2V to 5.5V and guarantees valid reset down to VCC = 1V, serving in critical µP power monitoring for industrial controllers and telecom equipment.
For engineers reviewing the MAX6702AZKA+ datasheet, MAX6702AZKA+ pinout, MAX6702AZKA+ application, or MAX6702AZKA+ equivalent, key selection factors include its active-high reset output, 3.08V fixed VCC threshold (suffix 'Z'), 1.6s watchdog timeout, 0.62V power-fail comparator input, and SOT23-8 package compatibility with multivoltage supervision designs.
Technical Context
The MAX6702AZKA+ implements a dual-comparator architecture: one fixed-threshold monitor for VCC (3.08V) and a separate 0.62V reference-based comparator for PFI, enabling early power-fail detection. Its reset generator asserts active-high RESET for ≥140ms after VCC rises above threshold or MR deasserts.
The integrated watchdog timer requires WDI toggling within 1.6s (typ) to prevent WDO assertion; WDO is push-pull active-low and latches on timeout unless cleared by WDI edge or MR low. Unlike A-version variants, MAX6702AZKA+ deasserts WDO only after valid WDI transition - not automatically upon VCC recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (fixed, suffix Z), ±3% over -40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (min), 280ms (max) - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware hang detection window |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables adjustable external voltage monitoring via resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and across multiple rail systems |
| Reset Output Type | Active-high push-pull - drives logic-high reset directly without external pull-up |
| Operating Temperature | -40°C to +125°C - qualified for automotive-grade and industrial embedded environments |
Pinout & Package
MAX6702AZKA+ uses an 8-pin SOT23 package (package code K8+2, outline 21-0078), surface-mount, RoHS-compliant, with 0.65mm pitch and 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible; internal 50kΩ pullup to VCC; forces reset when pulled low |
| 2 - VCC | Main supply input | Primary reset threshold monitor input; powers push-pull outputs; valid from 1.2V |
| 3 - GND | Ground reference | Common return for all internal comparators, timers, and outputs |
| 4 - PFI | Power-fail input | High-impedance node tied to 0.62V reference; accepts external voltage divider for secondary rail monitoring |
| 5 - PFO | Power-fail output | Active-low push-pull output asserted when PFI < 0.62V - signals impending supply collapse |
| 6 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising/falling transition; minimum pulse width 50ns |
| 7 - RESET | Active-high reset output | Push-pull, logic-high when asserted; guaranteed valid down to VCC = 1V |
| 8 - WDO | Watchdog output | Active-low push-pull; asserted on WDI timeout or VCC/RST_IN undervoltage - used for NMI or fault logging |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET | Eliminates need for external pull-up resistor; reduces BOM count and layout area in +3.3V µP systems |
| Independent WDO and RESET outputs | Enables simultaneous system reset and non-maskable interrupt generation without shared timing constraints |
| 0.62V precision PFI comparator | Supports accurate power-fail warning on auxiliary rails (e.g., 1.8V, 2.5V) using standard resistor dividers |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state during severe brownout or battery depletion conditions |
| 140ms minimum reset timeout | Meets JEDEC JESD78 reliability requirements for µP initialization timing margin |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
Use Scenario: Monitoring +3.3V I/O supply in programmable logic controllers with watchdog-triggered firmware recovery. IC Role / Device Role / Timing Role: Active-high RESET initiates cold boot; WDO feeds NMI to log watchdog faults; PFO triggers graceful shutdown on backup rail collapse. Use Value: Prevents spurious resets during transient dips while ensuring fail-safe response to sustained undervoltage - validated over -40°C to +125°C. | Use Scenario: Supervising primary DC-DC output in 48V telecom rectifiers feeding +3.3V FPGA and PHY subsystems. IC Role / Device Role / Timing Role: VCC monitor detects main rail brownout; PFI monitors +1.8V core rail via divider; PFO interrupts µP to save state before power loss. Use Value: 0.62V reference enables accurate 1.8V trip at 1.75V (±25mV), meeting GR-63-CORE hold-up time requirements. |
| Critical µP Power Monitoring | White Goods Control Boards |
Use Scenario: Ensuring reliable startup and runtime supervision of safety-critical microcontrollers in medical diagnostic equipment. IC Role / Device Role / Timing Role: RESET holds µP in reset until +3.3V stabilizes; MR allows service-mode forced reset; WDO validates firmware execution continuity. Use Value: 1.2V minimum VCC operation and 140ms timeout guarantee full reset assertion even under marginal input conditions. | Use Scenario: Managing power sequencing and fault response in smart refrigerator main control boards with multi-rail supplies. IC Role / Device Role / Timing Role: Monitors +3.3V system rail and +5.0V display rail (via PFI divider); PFO triggers compressor shutdown on early AC line sag. Use Value: Dual-threshold capability (3.08V VCC + 0.62V PFI) enables coordinated response across rails without additional comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702AKA+ | Same package and pinout, but A-version: WDO deasserts automatically when VCC recovers (no WDI edge required) | Better suited for systems where watchdog must auto-clear on supply recovery without firmware intervention | Select MAX6702AKA+ if automatic WDO clearance on VCC rise is required; MAX6702AZKA+ requires explicit WDI toggle |
| TPS3808G33DBVR | TI part with 3.3V threshold, 200ms reset delay, open-drain RESET, no PFI/PFO or WDO | Lacks power-fail warning and independent watchdog output - limited to basic reset-only use cases | Choose TPS3808G33DBVR only when PFI/PFO and WDO functions are unnecessary and open-drain reset suffices |
Compared with MAX6702AKA+, MAX6702AZKA+ offers stricter watchdog latching behavior ideal for fault-logging systems, while TPS3808G33DBVR trades feature depth for lower cost and simpler integration where dual comparators and watchdog are omitted.
Availability
MAX6702AZKA+ is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6702AZKA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family delivers compact, multivoltage µP supervision with integrated watchdog, power-fail detection, and manual reset - targeting space-constrained embedded systems needing high reliability and minimal external components.
FAQ
What is the reset threshold voltage of the MAX6702AZKA+?
The MAX6702AZKA+ has a fixed VCC reset threshold of 3.08V (±3% over temperature), corresponding to the 'Z' suffix in its part number. This value is guaranteed across -40°C to +125°C and is optimized for reliable supervision of +3.3V supply rails in industrial and telecom applications. The MAX6702AZKA+ does not support adjustable thresholds on VCC - only PFI and RST_IN pins accept external dividers.
Does the MAX6702AZKA+ provide an active-high or active-low reset output?
The MAX6702AZKA+ provides an active-high push-pull reset output (RESET pin). This is confirmed by its '2' designation in the MAX670x family naming convention and verified in the Pin Description table. Unlike MAX6701(A) or MAX6703(A), the MAX6702AZKA+ asserts logic-high on reset, eliminating the need for an external pull-up resistor and simplifying interface with µPs requiring high-active reset inputs.
What is the function of the PFI and PFO pins on the MAX6702AZKA+?
The PFI (Power-Fail Input) pin on the MAX6702AZKA+ connects to an external resistive divider to monitor secondary supply voltages, comparing them against an internal 0.62V reference. When the divided voltage falls below this threshold, the PFO (Power-Fail Output) pin - an active-low push-pull output - asserts to signal imminent power loss. This enables early-warning shutdown sequencing in systems with multiple rails, such as telecom base stations or industrial PLCs.
How does the watchdog timer behave on the MAX6702AZKA+?
The MAX6702AZKA+ watchdog timer requires a WDI edge (rising or falling) at least every 1.6s (typical) to remain cleared. If no transition occurs, WDO asserts low and remains latched until a valid WDI edge or MR low is detected. Unlike A-versions, the MAX6702AZKA+ does not auto-clear WDO on VCC recovery - it strictly requires WDI activity, making it suitable for fault-logging applications where persistent watchdog assertion is intentional.
Is the MAX6702AZKA+ compatible with lead-free soldering processes?
Yes, the MAX6702AZKA+ is RoHS-compliant and qualified for lead-free reflow soldering. The '+' suffix explicitly denotes lead-free packaging per Maxim's ordering nomenclature. It supports standard Pb-free reflow profiles with peak temperatures up to +260°C and is rated for soldering at +300°C for 10 seconds, matching IPC/JEDEC J-STD-020 requirements for moisture sensitivity level 1 (MSL-1).
MAX6702AZKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.32V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6702AZKA+ FAQ
1.How can I place an order for MAX6702AZKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702AZKA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6702AZKA+ reliable?
The price and inventory of MAX6702AZKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702AZKA+ is usually 5 days.
3.What payment methods are accepted for MAX6702AZKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702AZKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702AZKA+?
MAX6702AZKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702AZKA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6702AZKA+?
For technical support, including MAX6702AZKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702AZKA+ requirements.
6.How does Aetrix verify that MAX6702AZKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6702AZKA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6702AZKA+ meets industry standards.
7.What is the process for return or replacement of MAX6702AZKA+?
All MAX6702AZKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702AZKA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6702AZKA+ part is unused and in its original packaging.
Return procedure for MAX6702AZKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6702AZKA+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
